Submit & CheckFields buttons don't work anymore

Hi

I have a WD/Java component with an embedded interactive form. The form has two buttons, a SubmitToSAP and a CheckField button. Everything was tested on the development system and worked fine. The component was then deployed to the QA system and has also been tested successfully there.

Since a few days the WD does neither react on both of the buttons. Instead an error message appears indicating the following text:

Character string "0" does not exist in the set of allowed values

What seems strange is the fact that this issue started on the development system after a colleage had modified his WD/Java component (which does not contain an adobe form). After deploying this component on the QA system later we also got the issue there.